12117172 has 24 divisors (see below), whose sum is σ = 21719880. Its totient is φ = 5913600.

The previous prime is 12117121. The next prime is 12117221. The reversal of 12117172 is 27171121.

12117172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1838736 + 10278436 = 1356^2 + 3206^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35788 + ... + 36124.

It is an arithmetic number, because the mean of its divisors is an integer number (904995).

Almost surely, 2^12117172 is an apocalyptic number.

It is an amenable number.

12117172 is a deficient number, since it is larger than the sum of its proper divisors (9602708).

12117172 is a wasteful number, since it uses less digits than its factorization.

12117172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 529 counting only the distinct ones).

The product of its digits is 196, while the sum is 22.

The square root of 12117172 is about 3480.9728525227. The cubic root of 12117172 is about 229.6855943538.

Adding to 12117172 its reverse (27171121), we get a palindrome (39288293).

The spelling of 12117172 in words is "twelve million, one hundred seventeen thousand, one hundred seventy-two".